Synthesis and properties of Y-doped SrTiO3 as an anode material for SOFCs

Li, Xue; Zhao, Hailei; Shen, Wei; Gao, Feng; Huang, Xi; Li, Yue; Zhu, Zhiming

doi:10.1016/j.jpowsour.2007.01.008

Cited by 82 publications

(71 citation statements)

References 20 publications

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“…al. [25] in the temperature range in which the increase of electrical conductivity with temperature is observed, a polaron-type conduction mechanism occurs. That is, the localized electrons hop between the Ti 3+ , Nb 4+ and the Ti 4+ , Nb 5+ sites.…”

Section: Methodsmentioning

confidence: 97%

Electrical and structural properties of Nb-doped SrTiO3 ceramics

et al. 2009

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Niobium-doped strontium titanate synthesized via conventional solid-state reaction has been studied. Influence of niobium content on the lattice parameters and electrical conductivity has been reported. Various reduction conditions have been investigated. For samples reduced in hydrogen at 1400°C, a transition from thermally activated to metallic behavior has been observed. Maximum electrical conductivity (ca. 55 Scm −1 at 650°C) has been observed for the SrTi 0.98 Nb 0.02 O 3-δ sample. The relation of electrical conductivity with the porosity of the samples has been shown.

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Section: Methodsmentioning

confidence: 97%

Electrical and structural properties of Nb-doped SrTiO3 ceramics

et al. 2009

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“…If the Y content is larger than 0.09, insulating Y 2 Ti 2 O 7 phase forms and thus leads to drastic conductivity drop. [ 309 ] Yttria-doped strontium titanate (YST) is thermally and chemically compatible to YSZ [310][311][312] but not LSGM. [ 313 ] The electrical conductivity of YST strongly depends on the thermal and redox history.…”

Section: Titanatementioning

confidence: 99%

Solid Oxide Fuel Cell Anode Materials for Direct Hydrocarbon Utilization

Chan

Liu

et al. 2012

Advanced Energy Materials

280

159

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Solid oxide fuel cells (SOFC) are highly efficient energy conversion devices with the advantage of directly utilizing hydrocarbon fuels. Starting with a short introduction about the fuel challenges and early achievements in this field, this review paper focuses on advances in oxygen‐ion conducting electrolyte‐based SOFC during the last 15 years. Robust anodes immune to carbon deposition are a prerequisite for direct hydrocarbon SOFC. In this paper, direct hydrocarbon SOFC anode materials are classified into three general categories: Ni‐cermet, Cu‐cermet, and oxide‐based anodes. Oxide anodes are further classified in terms of their crystalline structures, namely fluorite, rutile, tungsten bronze, pyrochlore, perovskite, and double perovskite. Achievements and recent advances on these SOFC anodes are reviewed and discussed. The concluding remarks summarize the pros and cons of direct hydrocarbon SOFC anode materials along with the perspective of future research trends.

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“…Recently yttrium-doped strontium titanate (SYT) is considered to be a promising alternative SOFC anode material [1][2][3][4][5][6]. Several groups demonstrated that SrTiO 3 -based materials satisfied the anode requirements well, being thermodynamically stable in anodic conditions, electronically and ionically conductive, chemically compatible with the electrolyte and interconnect, and has similar thermal expansion coefficient as other cell components (The thermal expansion coefficient of yttrium doped SrTiO 3 and YSZ are (11-12) × 10…”

Section: Introductionmentioning

confidence: 99%

“…In this study t=1. 6. V c is the critical (percolation) volume fraction of SYT, and V SYT is the volume fraction of SYT phase in the composite.…”

mentioning

confidence: 99%

Electrical Properties of Sr0.86Y0.08TiO3 Under Redox and Full Cell Fabrication Conditions

Li¹,

Brouwer

2012

Journal of Fuel Cell Science and Technology

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The effects of manufacturing and preparation conditions on the structural and electrical properties of Sr 0.86 Y 0.08 TiO 3 (SYT) reduced in 5% NH 3 (95% N 2 ) are discussed. The realization of an SYT-based SOFC anode is challenging because the conductivity of SYT is highly dependent upon the thermal history combined with heat treatment atmosphere used in manufacturing. To obtain highly conductive SYT as a candidate for an SOFC anode material, all samples in this study were prereduced to 1400 o C under reducing conditions (ammonia) for 8 hours. After pre-reduction, 3 samples were oxidized in air at 850 o C, 950 o C and 1050 o C, respectively, for 4 hours to evaluate the impact of oxidizing conditions in practical cell fabrication processes on the SYT conductivity. XRD analyses showed that the lattice parameter of SYT sintered in ammonia was slightly different than the sample sintered in air. Measured at 800 o C in reducing atmosphere (dry N 2 /4%H 2 ), the maximum electrical conductivity of 36.3 S/cm was observed in SYT reduced in ammonia at 1400 o C. However, the observed conductivities were not preserved after oxidation-reduction cycles. Various SYT samples pre-reduced in ammonia at 1400 o C and then oxidized in air at 850 o C, 950 o C and 1050 o C showed an irreversible drop on conductivity measured in a reducing atmosphere, and the higher the oxidation temperature, the lower the conductivity became. The conductivity results indicate a strong dependence upon the SYT manufacturing and processing conditions. Despite the irreversible drop due to the oxidation cycle, the conductivity of SYT sintered in ammonia at 1400 o

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Synthesis and properties of Y-doped SrTiO3 as an anode material for SOFCs

Cited by 82 publications

References 20 publications

Electrical and structural properties of Nb-doped SrTiO3 ceramics

Electrical and structural properties of Nb-doped SrTiO3 ceramics

Solid Oxide Fuel Cell Anode Materials for Direct Hydrocarbon Utilization

Electrical Properties of Sr0.86Y0.08TiO3 Under Redox and Full Cell Fabrication Conditions

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